fix: unix domain socket path and examples

examples/function/forward_message/Dockerfile

@@ -0,0 +1,43 @@
+FROM python:3.9.12-slim
+
+ENV PYTHONFAULTHANDLER=1 \
+  PYTHONUNBUFFERED=1 \
+  PYTHONHASHSEED=random \
+  PIP_NO_CACHE_DIR=off \
+  PIP_DISABLE_PIP_VERSION_CHECK=on \
+  PIP_DEFAULT_TIMEOUT=100 \
+  POETRY_VERSION=1.2.0 \
+  POETRY_HOME="/opt/poetry" \
+  POETRY_VIRTUALENVS_IN_PROJECT=true \
+  POETRY_NO_INTERACTION=1 \
+  PYSETUP_PATH="/opt/pysetup" \
+  VENV_PATH="/opt/pysetup/.venv"
+
+ENV PATH="$POETRY_HOME/bin:$VENV_PATH/bin:$PATH"
+
+RUN apt-get update \
+    && apt-get install --no-install-recommends -y \
+        curl \
+        wget \
+        # deps for building python deps
+        build-essential
+
+# install poetry - respects $POETRY_VERSION & $POETRY_HOME
+RUN curl -sSL https://install.python-poetry.org | python3 -
+
+WORKDIR $PYSETUP_PATH
+ADD . $PYSETUP_PATH
+WORKDIR $PYSETUP_PATH
+RUN poetry install --no-dev --no-root
+
+ADD . /app
+
+# install dumb-init
+RUN wget -O /dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.5/dumb-init_1.2.5_x86_64
+RUN chmod +x /dumb-init
+
+WORKDIR /app
+RUN chmod +x entry.sh
+
+ENTRYPOINT ["/dumb-init", "--"]
+CMD ["/app/entry.sh"]

examples/function/forward_message/README.md

@@ -0,0 +1,16 @@
+# Example Python User Defined Function using Kafka sink
+
+1. Install Kafka in the Kubernetes cluster
+   ```shell
+   kubectl apply -f https://raw.githubusercontent.com/numaproj/numaflow/main/config/apps/kafka/kafka-minimal.yaml
+   ```
+
+2. Build the docker image and import into k3d
+   ```shell
+   docker build -t test-python-udf:v1 . && k3d image import docker.io/library/test-python-udf:v1
+   ```
+
+3. Apply the pipeline
+   ```shell
+   kubectl apply -f pipeline-numaflow.yaml
+   ```

examples/function/forward_message/entry.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+set -eux
+
+python example.py

examples/function/forward_message/pipeline-numaflow.yaml

@@ -0,0 +1,33 @@
+apiVersion: numaflow.numaproj.io/v1alpha1
+kind: Pipeline
+metadata:
+  name: local-kafka
+spec:
+  vertices:
+  - name: input
+    source:
+      kafka:
+        brokers:
+        - kafka-broker:9092
+        topic: input-topic
+        consumerGroup: test
+  - name: forward-message
+    udf:
+      container:
+        args:
+        - python
+        - example.py
+        image: docker.io/library/test-python-udf:v1
+  - name: log-output
+    sink:
+      log: {}
+  - name: log-kafka-output
+    sink:
+      log: {}
+  edges:
+  - from: input
+    to: forward-message
+  - from: input
+    to: log-kafka-output
+  - from: forward-message
+    to: log-output

examples/function/forward_message/pyproject.toml

@@ -0,0 +1,15 @@
+[tool.poetry]
+name = "example-function"
+version = "0.2.2"
+description = ""
+authors = ["Numaflow developers"]
+
+[tool.poetry.dependencies]
+python = "~3.9"
+pynumaflow = "0.2.2"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"

examples/sink/simplesink/Dockerfile

@@ -6,7 +6,7 @@ ENV PYTHONFAULTHANDLER=1 \
   PIP_NO_CACHE_DIR=off \
   PIP_DISABLE_PIP_VERSION_CHECK=on \
   PIP_DEFAULT_TIMEOUT=100 \
-  POETRY_VERSION=1.1.13 \
+  POETRY_VERSION=1.2.0 \
   POETRY_HOME="/opt/poetry" \
   POETRY_VIRTUALENVS_IN_PROJECT=true \
   POETRY_NO_INTERACTION=1 \
@@ -23,12 +23,12 @@ RUN apt-get update \
         build-essential
 
 # install poetry - respects $POETRY_VERSION & $POETRY_HOME
-RUN curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python
+RUN curl -sSL https://install.python-poetry.org | python3 -
 
 WORKDIR $PYSETUP_PATH
 ADD . $PYSETUP_PATH
 WORKDIR $PYSETUP_PATH
-RUN poetry install --no-dev
+RUN poetry install --no-dev --no-root
 
 ADD . /app
 

examples/sink/simplesink/README.md

@@ -7,5 +7,5 @@
 
 2. Apply the pipeline
    ```shell
-    kubectl apply -f pipeline-numaflow.yaml
+   kubectl apply -f pipeline-numaflow.yaml
    ```

examples/sink/simplesink/example.py

@@ -2,7 +2,7 @@
 from pynumaflow.sink import Datum, Responses, Response, UserDefinedSinkServicer
 
 
-def udsink_handler(datums: List[Datum], __) -> Responses:
+def udsink_handler(datums: List[Datum]) -> Responses:
     responses = Responses()
     for msg in datums:
         print("User Defined Sink", msg)

examples/sink/simplesink/pyproject.toml

@@ -1,12 +1,12 @@
 [tool.poetry]
 name = "example-sink"
-version = "0.1.0"
+version = "0.2.2"
 description = ""
 authors = ["Numaflow developers"]
 
 [tool.poetry.dependencies]
 python = "~3.9"
-pynumaflow = "0.1.0"
+pynumaflow = "0.2.2"
 
 [tool.poetry.dev-dependencies]
 

pynumaflow/function/server.py

@@ -49,7 +49,7 @@ class UserDefinedFunctionServicer(udfunction_pb2_grpc.UserDefinedFunctionService
 
     def __init__(self, map_handler: UDFMapCallable, sock_path=FUNCTION_SOCK_PATH):
         self.__map_handler: UDFMapCallable = map_handler
-        self.sock_path = sock_path
+        self.sock_path = f"unix://{sock_path}"
         self._cleanup_coroutines = []
 
     def MapFn(

pynumaflow/sink/server.py

@@ -2,17 +2,15 @@
 import logging
 from os import environ
 
-
 from google.protobuf import empty_pb2 as _empty_pb2
 
 import grpc
-from typing import Callable, Any, Iterator, List
+from typing import Callable, Any, List
 
 from pynumaflow._constants import (
     SINK_SOCK_PATH,
-    DATUM_KEY,
 )
-from pynumaflow.sink import Response, Responses, Datum
+from pynumaflow.sink import Responses, Datum
 from pynumaflow.sink.generated import udsink_pb2_grpc, udsink_pb2
 from pynumaflow.types import NumaflowServicerContext
 
@@ -48,7 +46,7 @@ class UserDefinedSinkServicer(udsink_pb2_grpc.UserDefinedSinkServicer):
 
     def __init__(self, sink_handler: UDSinkCallable, sock_path=SINK_SOCK_PATH):
         self.__sink_handler: UDSinkCallable = sink_handler
-        self.sock_path = sock_path
+        self.sock_path = f"unix://{sock_path}"
         self._cleanup_coroutines = []
 
     def SinkFn(

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pynumaflow"
-version = "0.2.1"
+version = "0.2.2"
 description = "Provides the interfaces of writing Python User Defined Functions and Sinks for NumaFlow."
 authors = ["NumaFlow Developers"]
 readme = "README.md"